Continuing Education
Oscilloscopes, Part One
An introduction to the complex educational tool that has varied uses. In this first of a two-part series, we will consider the oscilloscope as an educational tool. It is a...
Servicing of Hydraulic Elevators after Flooding
Flooding of machine rooms and elevator systems as a result of natural calamity or manmade problems is not uncommon. Every year, changing weather patterns and erratic climate cause billions of...
Maintenance Control Program Changes
Learn about the MCP and updates made to it since 2010. In the world of elevators, manufacturers design newer components to require less maintenance. Replacing an older elevator controller, full...
Digital and Analog Troubleshooting
Tools and techniques to help the technician find faults in circuits, signals and drives Physical quantities can be represented by numerical values in either analog or digital. The analog method...
Elevator Door Force
Maladjustment of elevator door controllers can cause injury to persons if impacted by a closing door with a high speed. Persons can also be entrapped or crushed by a door...
Working with JFETs
Details on and how to deal with junction field-effect transistors (JFETs) on the job JFETS are composed of N- and P-type crystalline silicon layers that have been doped. The underlying...
Motor Controllers
Types, requirements, and diagnostics and repair are among the aspects of motor controllers this overview addresses. The National Electrical Code (NEC), which has jurisdiction over subjects in which it has...
Lubrication and Elevator Ropes: Myths, Half Truths and Mistruths
An examination of a key component to rope life and rope performance by Martin Rhiner and Heinz Studiger There is an old saying that bears repeating when discussing elevator rope...
Elevator Hoistway Doors
Failures of door guiding means and door safety retainers on horizontally sliding doors can cause catastrophic injury to someone falling through a hoistway door into the hoistway when the elevator...
Integrated Circuits
The history, application and maintenance of these important microelectronics components are explored. In the microelectronics continuum, integrated circuits (ICs) are probably close to their midpoint of development. They have progressed...
